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19. Add 3, then add 4, then add 5, then add 6,etc.
To add mixed numbers and whole numbers, you simply treat the mixed numbers like they are whole numbers (4 3/4) turns to (4), then add the regular whole number, say, 7, and then re-add the fraction. For example, if you were adding 4 3/4 and 7, you would change 4 3/4 to 4, add 7 to get 11, then add the 3/4 back in, to give you 11 3/4.
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It is called consecutive adding.
There is no reason why you can't add the same number as much as you wish. Though, if you wish to add 4 + 4 + 4 + 4 you could use 4 x 4 = 16